Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3cd25438a50286…

MALICIOUS

PDF

62.0 KB Created: 2020-09-17 11:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb76a13a9b1beac0017f2cf4311588b2 SHA-1: 3c8d567a47286cde6d71f294f2af5132cd9acb26 SHA-256: af3cd25438a50286f23717baa0cbe26990b67dcde25a1f856a67d2c79cc5fc62
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.me'. This suggests the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/wix?keyword=farmer+john+spiral+ham+heating+instructions
    • https://cdn.shopify.com/s/files/1/0462/7929/5125/files/60358065370.pdf
    • https://cdn.shopify.com/s/files/1/0459/7114/4871/files/xexeduwafudebuwesezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/zitemobidapaw.pdf
    • https://50deb9f0-4718-4dd6-bdd8-2c14bf4e9eb9.filesusr.com/ugd/4479ed_ecfe2a8522a14308a0e36331fa9414eb.pdf?index=true
    • https://90e8ba1e-89ab-40d7-a82e-f84fc09ab08e.filesusr.com/ugd/d9f7b5_ed9114b9c0ad40d081157cf02cb31873.pdf?index=true
    • https://a95259a5-6271-4b1b-abb2-a2a40ff40146.filesusr.com/ugd/3bf302_a6800e83148e4b8ca867d0807f88e560.pdf?index=true
    • https://e66aa999-1901-4c87-a2a8-17ca40f23654.filesusr.com/ugd/221eaa_27323709184c4cf7ad59c59c037aef96.pdf?index=true
    • https://3a863b9f-0caf-4fbc-b4e9-0887657f0e05.filesusr.com/ugd/bcfc12_43a4f9c29b174cb19b7d7335a3d5bfc4.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zexula.pdf
    • https://cdn.shopify.com/s/files/1/0432/9766/9278/files/reduction_of_formic_acid_to_formaldehyde.pdf
    • https://0c1b2791-ca99-4634-bddb-f9f7858b0527.filesusr.com/ugd/f08e01_ef8b5c7c48a54f41a24db3c5e880678e.pdf?index=true
    • https://30f64220-e628-47e8-b617-c7ea12ab80fb.filesusr.com/ugd/b50c55_16b9f370ad204ebe8b34df922a484ab9.pdf?index=true
    • https://9a8380fe-5ad7-4891-80cf-19cd195a6b66.filesusr.com/ugd/b77b08_1b560efa9a8a4b3bab5fa32976738496.pdf?index=true
    • https://33bed742-6482-4240-84c3-10cd33320220.filesusr.com/ugd/65b209_44d4cc3e77e8439ea8943cd571ba96ee.pdf?index=true
    • https://1f95cb01-5f22-4848-9bab-0bae8a615e52.filesusr.com/ugd/61567a_c134baa0721a4613905a3618ff0aedc8.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a849.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA849 2828 bytes
font_01_sfnt_off0000b243.bin
2fce2b88ea3088c8b1e7f25bbce8c253ba115c1991ad1911d84150add0c4c3fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB243 5380 bytes
font_02_sfnt_off0000c46d.bin
679826bc55eec31f1bdc4ea1421d368954dcb1785e2a1a2690fcdda90a078e81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC46D 10956 bytes

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